When you're squadding a match and Joe and Bill and Bob want to be on the same squad, you can lock their squad assignments so you don't inadvertently assign them to a different squad.

 

Just mark the box on a shooter's registration that you want to lock.

 

 

The registration screen for that match will flag "locked squad" shooters in yellow.  The shooter's registration screen will have an asterisk by the squad number (see previous picture.)